Cloud function: class with helpful functions.

RemoteConfigFunctions.ts

import { PlatformSettingsObj, PushTopics, Platform } from './RemoteConfigObj';
import { SCOPES } from '../SecretProperties';
const { google } = require('googleapis');
/**
 * This method is for requesting an access token.
 * @param service - is the service account data.
 */
export function getAccessToken(service: any) {
    return new Promise(function (resolve, reject) {
        const jwtClient = new google.auth.JWT(
            service.client_email,
            null,
            service.private_key,
            SCOPES,
            null
        );
        jwtClient.authorize(function (err: any, tokens: { access_token: any; }) {
            if (err) {
                reject(err);
                return;
            }
            resolve(tokens.access_token);
        });
    });
}
/**
 * This function chooses on which topic will send notifications.
 * @param platformSettings - platform settings from remote configuration.
 * @returns Array<string> - array of topics.
 */
export function choosePushTopics(platformSettings: PlatformSettingsObj | null):Array<string> {
    const topic: Array<string> = new Array();
    if (platformSettings!.isPushAvailable) {
        const flavor = platformSettings!.isItDev ? PushTopics.DEV : PushTopics.PROD
        if (platformSettings!.platform === Platform.BOTH) {
            topic.push(Platform.AN + "_" + flavor)
            topic.push(Platform.IOS + "_" + flavor)
        } else topic.push(platformSettings!.platform + "_" + flavor)
    }
    return topic
}